How to DIY a Shade Sail Installation

Learn how to install a shade sail. A DIY Shade Sail installation is a budget-friendly way to add shade over your deck or patio.

If a standard patio umbrella isn’t cutting it, upgrade to a shade sail (also called a sun shade). These affordable sails are a beginner-friendly DIY project that you can complete in a few hours.

Our deck gets hours of hot sun in the afternoons. This makes it both:

• unenjoyable during the summer and
• difficult to grow any plants.

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Shade Sails vs. Awnings, Umbrellas and Pergolas

We have a large patio umbrella, but it only covers a small portion of our deck with shade. Originally, we planned to add another umbrella.

However, at ~$75 for the umbrella and ~$75 for a sturdy base, it’s more expensive to add an umbrella than to install a shade sail (and provides less shade than a sail).

Not to mention, the umbrella bases take up valuable floor space.

Another option is to install an awning. However, with an awning, the house would get much less natural light since it would be over the kitchen windows.

A shade sail allows us to cover the deck away from the house – leaving the windows with access to plenty of natural sunlight.

A pergola would be lovely, but we nixed that idea due to cost and weight. A pergola is more expensive and would put more weight onto our deck supports and frame.

Selecting a Sun Shade Sail

In order to select a shade sail, you’ll need to choose a shape in the correct size and in a color complementary to your home’s exterior.

Let’s discuss selecting the shape, size, and color for a shade sail.

SHAPE | How to Choose the Right Shape

Most shade sails are available in 1 of 3 shapes:

• Triangle (equilateral and right angle)
• Square
• Rectangle

Choose the best shape based on the area which you are trying to cover (and the area you don’t want to cover). What do I mean by that?

For example, our deck is square (18.5’x18.5’). Therefore, it may seem the obvious choice would a square shade sail.

However, we wanted to leave the portion of the deck nearest the house uncovered. Why? Sunlight through the patio door and kitchen window is a priority. Therefore, we wanted the sun shade to hang out away from the house.

This led us to choose a right angle triangle shade that covers half of the deck.

Note: Sun shades are not perfectly triangle, square, or rectangle. There are concave curves on each side of the shape which help make the shade sail taut.

SIZE | How to Measure for a Shade Sail

To determine the correct shade sail size, you must first determine where it will be mounted. Even if you don’t yet have the mounts installed, you’ll need to know where the mounts will be located.

Measure the distance from each mounting point to the next mounting point. There are several ways to do this:

• For a good estimate, use measuring tape stretched from point to point.
• For an exact measurement, string twine from point to point. Mark the endpoints in the twine. Take the twine down, and measure the string length.

We used measuring tape initially, then used twine for a visual and to confirm our plans before purchasing the shade sail.

Once measured, buy a shade sail that is smaller than the overall dimensions. For example, our dimensions were 17’x17’x22.5′ and we purchased a 15’x15’x21′ shade.

You’ll also need to account for at least 8-12″ allowance between the mounting point and the sail. This may differ by shade sail, so make sure to confirm this distance before purchasing.

Therefore, the best size will follow this formula:

Distance between Mounting Posts – Allowance = Size of Sail

Example (using our post distance of 17’x17’x22.5′):

1. 17′ between posts – 12″ allowance on each side = 15′
2. 22.5′ between posts – 9″ allowance on each side = 21′

COLOR | Shade Sail Ideas

The best color shade sail will be based on personal preference. For our home, we choose a light gray-brown similar to our shake siding.

We weren’t looking to add contrast, so a muted tone made sense for our deck.

However, if we wanted it to be a focal point we could choose something like a clay red shade.

If the shade sail is covering a pool or poolside patio, you might choose a teal or aqua color.

Adding shade over a playground? Consider an energetic, playful color like orange.

Want your shade to blend into the natural surroundings? Try a forest green.

You don’t even have to stick to solids, there are prints, too! This striped blue and white would be perfect for a coastal home.

DIY Shade Sail Installation

Installing a shade sail occurs in 2 phases: mounting the posts and hanging the sail. Let’s discuss how to complete each process.

How to Mount a Shade Sail

Shade sails can be mounted to several materials:

• wood posts
• steel posts
• exterior of a home

If you choose to mount it to the exterior of your home, be sure to mount it to a strong location (such as concrete, brick, etc.). The mounting point must withstand the force of strong winds without damaging your home.

We chose not to mount the shade sail to our house because we didn’t want to risk damaging our siding.

Mount to Wood Posts

Wood posts are the most affordable method for mounting shade sails. The wood posts can be:

• integrated into a deck or fence, or
• cemented into the ground.

We chose 4×4 treated wood posts and installed them while renovating our deck. If we had not been rebuilding the deck, we could have attached wood posts to the outside of the deck frame.

If you are using wood posts, purchase a steel hardware kit like this (make sure to select either triangle or square/rectangle, depending on your shade sail).

Important Note: These sets only come with 2 turnbuckles. There are carabiners for the other corner(s). We chose to go buy an extra turnbuckle for the 3rd corner. This isn’t necessary, but we felt it gave us more precise control to tighten the sail.

Mount to Steel Posts

Of course, there are disadvantages to wood posts (such as maintenance) which may lead you to select steel posts to mount a shade sail.

Similar to wood, metal posts can be:

• attached to deck or fence posts, or
• cemented into the ground.

Make sure to purchase posts that are durable and sturdy, such as galvanized steel.

Depending on the post size, you will need round connector clamps like this to attach the sails.

And, finally, like the wood hardware kit, you will still need the turnbuckles and carabiners.

Important Note: These sets only come with 2 turnbuckles. There are carabiners for the other corner(s). We chose to go buy an extra turnbuckle for the 3rd corner. This isn’t necessary, but we felt it gave us more precise control to tighten the sail.

How to Install a Shade Sail

In the printable card, you’ll find the directions for how to install a shade sail. After the card, review the FAQs and tips and tricks for additional info.

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